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Xenoplanetary Condition-Trained Infantry, also known as XCT or Hazardous Environment Troops, are infantry which have undergone rigorous training and received special equipment that allows them to fight in areas and on planets dangerous to human life. This can range anywhere from nuclear waste sites to planets with toxic atmospheres, or no atmosphere at all.[1]. Among those notable XCT units are the Eyrie Defense Force, part of the Eagle Corps, SAFE's special forces branch. These soldiers are charged with defense of SAFE's Eyrie headquarters, a hidden bunker on Wendigo (a moon of Atreus). When the FWL dissolved, SAFE was similarly broken up, although the Marik-Stewart Commonwealth retained the Eyrie and its defense force.[2]